The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 21, 1994
Filed:
Jun. 27, 1991
Applicant:
Inventors:
Bernard F Kieffer, Huntsville, AL (US);
John R Peterson, Salem, OR (US);
Timothy R McQueary, Sweet Home, OR (US);
Matthew A Rossback, Albany, OR (US);
Lloyd J Fenwick, Corvallis, OR (US);
Assignee:
Teledyne Industries, Inc., Albany, OR (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01G / ;
U.S. Cl.
CPC ...
75419 ; 75 1043 ; 75622 ;
Abstract
Ferroniobium, ferrotantalum and ferrovanadium alloys are hydrogenated to facilitate crushing then nitrided, and then acid-leached to produce a soluble iron nitride leachate and a niobium, tantalum or vanadium nitride residue which residue can be denitrided to yield the metal which can be recovered by melting.